David Kirshner is professor of mathematics education at Louisiana State University. His research interests include the psychology of algebraic symbol skills, and the relations of pedagogical practice to psychological theory.

David Kellogg

David Kellogg teaches English language education and integrated subject teaching for primary schools at Seoul National University of Education. He is interested in play and child development, and is currently working with his graduate students on a Korean translation of Vygotskyʹs last book Thinking and Speech.